FANG by James Patterson

Max and the Flock are flying high over Africa, but this time they're not alone. A sky full of cargo planes accompanies the team as they bring much-needed aid to the continent's poverty stricken regions. Among the volunteers is the mission's benefactor--the mysterious billionaire, Dr. Hans Gunther-Hagen. Max is intrigued by his generosity, but there's also something about him--and his intense scrutiny of the Flock--that makes her nervous.
But Dr. Hans isn't the only puzzling thing about their trip. The Flock also receives a cryptic message from a young girl, who tells them, "The sky will fall." Max and the Flock are ready to return home, still unable to make sense of her statement. But the surprises don't end with their departure, and something unbelievably momentous shakes up the Flock--pushing Max and Fang closer than ever. Will the team be able to stick together through the chaos?